>I don't know the answers to these questions. Here is an example of the encrypted string:
>

>xvneoUNC7ùêæĵ˜†]T>"Ûͪ“m|+ 缨pMöûžjBÓ±zIǼw9öŒKÐ¥Ȑw
¾q)ЗOý²PÇlûtÊs)¿f¯|ï•-ÎX§8ÖJ‰;Çgé| ™µEÏVîfëpíX‘‡3ø{÷\ç[ÕHð4­ˆËhÒ@³+…èW¿‡ïO¬>nË(ŠÕ>œòK‘õLŠäg„ð$kúe¿ç‚ÕM£Ä
Q†éT–¸Õ*rƒßØ's¯¯s"Í–ŸsSÖÂ¥‚bq"êÏ㻆iwp-=ÔôÃج“¸´Šƒ«—–mo\
>

With this value, your best bet is varbinary(). It contains non-printable characters (and also length is 251 for this sample).

I would use varbinary(MAX) but you can choose an arbitrary max length like varbinary(8000).