You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
block
In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks. They are specified elementary components in the design of many cryptographic protocols and are widely used to the encryption of large amounts of data, including data exchange protocols. It uses blocks as an unvarying transformation.
Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key. A multitude of modes of operation have been designed to allow their repeated use in a secure way to achieve the security goals of confidentiality and authenticity. However, block ciphers may also feature as building blocks in other cryptographic protocols, such as universal hash functions and pseudorandom number generators.
Having had a week of asking various help desks i'm hoping that somebody on here will be able to add some clarity to the following situation?
Having purchased a Quinn centre feed radiator and fitting straight TRV and Lockshield the rad didn't heat up evenly and sometimes not at all. Quinn tell...
I have got a mate who is working for a plumbing company in a block of flats. Apparently there is 20 wb boilers installed that need to be commissioned. All gas carcass is track pipe and is all on show, and the boiler is the only appliance. All flues exit out of the wall.
Would you commission...
hi
Does anyone the correct way (i.e. that building control will accept?) of blocking off a disused inlet inside a plastic inspection chamber. I have removed the downstairs loo from my house and wish to cap of the inlet inside the chamber. I know that you can buy caps that can be fitted on to...
terry1952
Thread
block
chamber
house
inlet
inside
inspection
outside
Hi,
We are having a new Back to wall toilet fitted
with a 'box' built to hide the cistern.
The plumber/bathroom fitter has said he cannot
cut into the old lead soil pipe which will be behind the
pan. if we could cut it back though it would mean this
'box' could be reduced which would be...
Scorps79
Thread
block
flats
inside
lead
oil
old
pipe
soil
soil pipe
In blocks of flats, is it normal for all the toilets to share a single soil stack / SVP?
So if there is a blockage in the lower part of the SVP, what is to stop the sewage backing up and overflowing from a lower flat's toilet?
All the sewage from the flats above would keep flowing down and the...
Have seen many differing formulas for this.
My system volume is 1417 litres
My static head is 11 metres
PRV set at three bar
One calculation I found said it should be 145 litres... can you imagine?
Another said 50, which seems more realistic!
Cheers
slide
Thread
block
expansion
expansion vessel
large
should
size
system
vessel
hi everyone,
I need to hang a heavy vertical rad (10,500 btu) onto a dot and dab plasterboard wall with breeze block behind it. This is the first time i have needed to hang something this heavy onto breeze block and am just looking for some advice on what fixings are best for this situation...
Hi I have a customer that wants a mono block bath tap in the corner of a bath. The area were they want it has no wood under it I plan on drilling the hole and putting a piece of plywood under it siliconed to the underneath of the bath and then when I fix the tap it will hold it in place. Anyone...
Just a general question. It seems to be well known that for certain reasons, cold feeds on o/v systems collect magnetic debris. Do combined F and Vs get the same problem?
Over the last few weeks the upstairs en suite toilet hasn't been flushing completely. Occasionally there were remains in the bowl after flushing, but there was no significant rise in the water level in the bowl on flushing.
I have started with the basics like dumping an extra bowlful of water...
has anyone done the plastic hydro block on the glowworm flexicom the last one I passed to group service as it looked a pain - got one that's weeping had a quick look but the 2 retaining screws seem unaccessible from underneath due to the boiler jig base - should I do or pass on
Hi, have found this forum especially for this annoying issue.
About 3 months ago the water pressure in the shower dropped for seemingly no reason. During the day, from 7am - 7pmish, hot water taps throughout the flat are poor, worst in the shower. The cold taps are better but not as good as...
Uberalles1982
Thread
block
during
flats
low water pressure
night
pressure
strong
water
water pressure
Hi Everyone
I'm Rob, I have just started out on my own after qualifying in Plumbing & Domestic Heating NVQ Level 2. It's going OK at the moment but it's quite nerve-racking being self-employed and trying to make a living out of bathroom installations.
Hope to be able to ask questions of you...
Hi, I was wondering what is the best way to fasten a small basin to a wall consisting of plasterboard and then a fairly soft breeze block ?
Any thoughts appreciated
Hi All
Sorry to bother you, but I am replacing the synchronous motor on a Honeywell motorized valve. I've bought the universal synchronous motor that Tool Station sell.
One of the two wires from the original goes to a connecting type block on the valve. There are three other wires going into...
evenin lads......quick question for ya as I'm not sure on the answer....can a free standing cooker that is made before 2008 and has no fsd's be installed in a tower block? I know someone who is moving into a flat and has an older cooker......just because she is moving into a flat does she have...
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.