$q,(1)$ RCA is a block cipher.

$q,(2)$ RCS is a stream cipher.

$q,(3)$ RC$5$ uses S$-$box.

AES is a symmetric key stream cipher.

$q,(5)$ The round keys for each round in AES are the same.

AES only uses $128$ bit key.

AES can encrypt $128$ or $192$ or $256$ bits data at a time.

AES allows variable number of rounds.

$q,(9)$ AES's roundkeys can be precomputed and saved in the memory for encryption or decryption.

$q,(10)$ The EC$$B mode of $3$DES allows random access of the encrypted blocks in a file.

$q,(11)$ The CBC mode of $3$DES allows random access of the encrypted blocks in a file..

$q,(12)$ Using the OFB mode of $3$DES, one bit of data error only affects one bit ciphertext.

$q,(13)$ The CTR mode of $3$DES allows random access of the encrypted blocks in a file.

$q,(14)$ Although RCS allows variable key length, it only encrypts data black of $64$ bits.

$q,(15]$ RCS allows variable number of rounds for eneryption.

$q,(16)$ The S$-$boxes used in DES are slightly modified to be used in AES.

$q,(17)$ Two different subkeys are used in each round of RCS$.$

$q,(18)$ The byte substitution used in AES is to achieve the diffusion effect.

Same hardware$/$software can be used to perform both encryption and decryption in AES,

$q,(20)$ The S$-$box and inverse S$-$box used in AES are well studied and examed by the public $.$

$q,(21)$ Each word in a round key contairls $4$ bits.

$q,22)30$ES fiardware can be used to perform DES operations.

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In $30E5$ you must select $3$ different keys.

$q,24)$ The selection of AES as the encryption standard is an example of security through obscurity.

AES is just as secure as one$-$time pad.

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